This reaction does not cause a rise in temperature. One other source is triboluminescence which is light produced from friction. Another source is electric discharge which is light produced when an electrical current passes through air or another, like neon, that produces a glow. Another source is light-emitting diode which is light produced when an electrical current passes through a semi-conductor which controls how well is conducts electricity.
There are different ways that prints can be developed in crime labs; by the use of traditional powders, fluorescent powders, chemicals, and superglue. They can be viewed under laser and UV lighting. When the finger print analysis was done on the magazine, Christopher Vaughn’s fingerprints did not show
Cadet Eric Wiggins Date: 18 September 2014 Course Name: Chem 100 Instructor: Captain Zuniga Section: M3A Identification of a Copper Mineral Intro Minerals are elements or compounds that are created in the Earth by geological processes. The method of isolating metals in a compound mineral is normally conducted through two processes.
In cycle one, the double displacement reaction, Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) occurred, the result of the reaction was that the reaction mixture began to bubble with the copper filling dissolving and a vapor like substance leaving the reaction. Furthermore, when water was added, the color change, from brown to a blue color pigment. Then in Cycle two, another double displacement reaction occurred, Cu(NO3)2(aq) + 2NaOH(aq) → Cu(OH)2(s) + 2NaNO3(aq), which resulted in the reaction becoming cloudy and a darker shade of blue. Following cycle two, a decomposition reaction occurred as the result of heat being administered to the mixture, thus the following reaction occurred in cycle three, Cu(OH)2(s) → CuO(s) + H2O(l). As a
The first step is to place a drop of distilled water on a sterile swab and swab a small portion of the suspect substance, The place the swab against a presumptive blood test and an immediate color change should occur if the reaction is positive. If the stain is negative the suspected blood stain may be ignored. If the reaction is positive an evidence number is assigned to the suspected blood and the stain is photographed and measured. The forensic technician should note the stain was collected due to a positive reaction. The blood is then collected and packaged, and the package is sealed and labeled for identification Upon collecting blood if the blood is wet a sterile swab should be rotated in the stain, transferring the blood to the swab.
Tyler White CHEM151LL 32658 04/01/2018 Different Types Chemical Reaction Types and Equations Purpose: The purpose of this lab experiment is to examine different types of chemical reactions such as Decomposition reaction, Synthesis reactions, Combustion reactions, and different Chemical equations. The experiments were conducted online using Late Nite Labs. Materials: Because the experiments were conducted online there wasn’t any physical use of materials, only digital ones, for these labs to be performed. Only the registration for the website was needed to perform these online labs, as well as a desktop computer.
The chemiluminescence part of the experiment, we had to make four solutions labeled as ‘stock solution A, solution A, stock solution B, and solution B’. For the ‘stock solution A’ we put the luminol product, (0.242 g) in a 25 mL Erlenmeyer flask and dissolve it with 2 mL of 3M NaOH. Then we took 1 mL of the ‘stock solution A’ and diluted in 9 mL of water using a 50 mL beaker. Solution A. For the ‘stock solution B’ we mixed 4 mL of potassium ferricyanide solution and 4 mL of hydrogen peroxide solution using a 25 mL Erlenmeyer flask.
A positive aspect of this is that forensic scientists only need a small amount of a sample to get the results they need (“Forensic Science” 12). These samples can come from many other forms of identification other than fingerprints and bloodstains. A few moderate examples include strands of hair, tiny beads of sweat, and a saliva specimen (“Forensic Science” 12). Forensic Science Technicians stated that “crime scene investigators may use tweezers, black lights, and specialized kits to identify and collect evidence.” They also stated that examining autopsies prove to be beneficial in a crime investigation (“Forensic Science Technicians”
Copper Cycle Lab Report Ameerah Alajmi Abstract: A specific amount of Copper will undergo several chemical reactions and then recovered as a solid copper. A and percent recovery will be calculated and sources of loss or gain will be determined. The percent recovery for this experiment was 20.46%.
His choice of words does not just bring understanding to the reader, but it also helps the reader to think. In the article the author uses the word chemiluminescent, which is a chemical reaction that does not produce significant quantities of heat. He explains that with this it would be hard for them to find the evidence. Another word he used is fluorescence, which is the visible or invisible radiation emitted by certain substances as a result of incident radiation. Throughout the article the author uses plenty other word for the article, but he mainly elaborate on these two
During this week, we performed the Meiosis pipe cleaner project and completed worksheets pertaining to meiosis. Afterwards, we took notes on karyotyping and finished worksheets for it. Regarding the meiosis pipe cleaner project, it is similar to the mitosis project since the chromosomes have a specific color key to them. However, in the meiosis project, we incorporated alleles in the chromosomes, by representing them with tightly loop pipe cleaners around the legs.
The result is an exothermic reaction that dissolves the copper. As the copper is oxidized, there are two products: copper(II) nitrate solution and nitrogen dioxide. These can be seen the image below, the green liquid is the copper(II) nitrate solution and the red gas is nitrogen dioxide. 3Cu(s) + 2NO –(aq) + 8H+(aq) → 3Cu2+(aq) + 4H O(l) + 2NO(g) 32
Forensic chemists usually work in a laboratory setting and they often go standing for long periods of time with a lot of technical equipment. They must follow strict pressures when handling evidence. They also use scientific protocols to ensure the quality and reliability of tests and equipment. You must do your work as efficiently as you can but still get results that are accurate.
3.1 ABSTRACT The intermolecular interactions in the N-methylformamide with acetophenone, cyclic ketones (cyclopentanone and cyclohexanone) binary liquid systems are studied in combined experimental and computational methodology. The speed of sound (u), density (ρ) and viscosity ( ) values are measured for binary mixtures of N-methylformamide with ketones over the entire range of mole fraction at temperatures T= (303.15 to 318.15) K, at atmospheric pressure. From the experimental results, the values of excess molar volume ( ), excess isentropic compressibility (κsE), deviation in viscosity (η) and excess Gibbs free energy of activation of viscous flow ( ) are evaluated. The experimental results indicate the intermolecular association between the binary liquid
The wand-lighting charm is a charm we discussed in lesson one. The wand-lighting charm is a simple spell that does exactly that: lights the tip of your wand. It is believed to be invented by Levina Monkstanley sometime in the 18th century. The incantation for the wand-lighting charm is lumos, pronounced loo-mos. The wand-movement is as simple as it gets, as it 's just a single counter-clockwise loop.
